Will FED initiate a (mini)crisis?

http://independenttrader.org/will-fed-initiate-a-mini-crisis.html

On paper, central banks are responsible for two things. They decide about the supply of currency and set interest rates. If the economy is healthy the velocity of money circulation grows higher creating inflation. Raising interest rates help to cool off the overheating economy. On the other hand, if the economy is heading for a recession central banks lower interest rates to make available to society credit cheaper and stimulate spending. This helps the economy get up from its knees. This is the theory.
Historically we see that central banks kept interest rates very low not to prevent economies from apathy but to create speculative bubbles and crashes that follow them. The control over economic cycles exercised with money supply and interest rates made it possible to transfer wealth out of the middle class to the financial sector.